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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fcf5451c0d01c3f6cb3f9c525ef022d672276d986d65172a55dae2e80e280edf' 
  AND token = '9odilGbIkpsZ7vvuD6wqmOqK4p8mckGyQTPH4FCe1gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}